⚡ Bolt: Batch config loading during bulk insertions to prevent O(N) disk I/O

[Donach]

💡 What: Refactored applyWorktreeCreateDefaults to run synchronously and accept a pre-loaded configuration.
🎯 Why: loadConfig() reads and parses the configuration YAML file from disk on every invocation. Calling it inside Promise.all(data.map(...)) resulted in O(N) redundant disk reads during bulk worktree creation.
📊 Impact: Reduces disk reads from N to 1 during array creations.
🔬 Measurement: Bulk creation latency should be visibly improved, especially on slow disks or under heavy daemon load. Can be verified by creating multiple worktrees in one payload.

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PR created automatically by Jules for task 14301604454817717030 started by @Donach

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